Their present condition. What they had accomplished. Working for love. Contemplating the hoard in the cave. Selfishness at the bottom of the pirates' lives. Gathering sugar cane. Honey, and its uses in ancient times. Beets and various tubers. Fattening properties. Nitrogenous matter. The load of cane. Making a sugar mill. Lime in sugar-cane juice. Clarifying sugar. A candy pulling. Granulating sugar. The earth as a magnet. Electricity. Positive and negative. Magnetic poles. Likes and unlikes. Making a magnet. Retaining magnetism in a bar.

A barometer. Air pressure. A compass. The atmosphere. Dry weather. Observing weather conditions. Providing compartments in the boat for provisions. Bedding. Water supply. Faith. Preparing a tablet for the Cataract. A terrific storm. A delayed departure. How delays have often proved valuable to investigators. Starting the voyage to the west. Striking a course. Observations on speed. Going with the wind. Tacking. Angles of incidence. The action of air on a surface. Determining the pressure of air by its velocity. Flying machines. Time and speed in a vessel. Qualities necessary in a sailor.

The shadows of night. Recalling memories of their shipwreck. The charting board. Cardinal points of the compass. How direction traveled is laid out on the chart. Measurement by angles. A weary night. The watches. The wind changing. The second day. Cliffs beyond. Sailing against the wind. Rounding the northern point. The fourth day. The increasing gale. Night. The lights to the south. The gale turning to a storm. Driven back. A night without sleep. An appalling monsoon. Springing a leak. The Professor exhausted. Danger ahead. The cliffs. A maelstrom in sight. Averting the danger. Recovery of the Professor. Steering for shore. Striking the beach. The vessel shattered. Stranded miles from home. Taking up the march. Putting an inscription on the boat. Nearing home.

The blackened fire space. Discovery of their own camp in the forest. An adventure in the woods. A huge bear. George's shot. Charging the Professor, and his shot. Attacking George. Safety behind a fallen tree. Search for the luggage. The cries of Angel. The bear finding their packages. The bear making use of their things. What they had left. The yellow pear. Guava. The coffee tree. Cherries. Gathering coffee berries. How Angel made himself understood. His excitement. The discovery of a number of orang-outans. Red Angel visits them. He is not welcomed. Return of the animal. The clearing in the woods. Recalling the fight of the bears over the honey.

The flag on Observation Hill. Approaching Cataract. The alarm by Red Angel. The house intact. Discovery of a man at the stable. His peculiar actions. Lost memory. Aphasia. Unable to speak. Recognizing the signal flag on the strange man. Provided with clothing. A peculiar malady. The instinct of self-preservation. Going with George to Observation Hill. The actions of a sailor. The stranger visits the workshop. Expert with the use of tools. Projecting an exploring trip by land. Naming the stranger John. Startled at sound of the name. Mechanically performing work. Examining the skulls.

The food supply. Butter. Cream. Centrifugal motion. Difference in specific gravity between cream and milk. Making a cream separator. Vegetables. Onions. Chives. The stranger as a prospector. Procuring samples. Peculiarities of his malady. An exciting encounter with a bear. John's skill as a hunter. Another honey tree. Killed with a spear. The bear pelt. Visiting the falls. Action to indicate that John recognizes the falls.

Mystery about John. Humanity's search. The desire to know and acquire. Gathering supplies for an extended trip by land. The boys visit the cave. Determine to search the chamber visited by the Professor. Gorgeous calcareous hangings. The ghosts of past centuries. Gold and silver vessels. Skeletons. A recess. A row of chests. Spanish guns. The chained skeletons in the recess. An arsenal. The struggle. Locked in the embrace of death. Ancient origin of the cave. Paleontology. Stone and bronze ages. Atlantis, the great continent in the Atlantic, which disappeared. Story of the Egyptian priests. The actinic rays. Purifying action of sunlight. Bacteria. Glass houses. The eye. How it expresses character. Laughter. How it brightens the eye. Fishhooks. A fishing party. The salmon.

Preserving fish. Why heat is used. The use of tin for cans. Music. The violin made by the boys. Violin strings; what they are made of. How they are prepared and treated. The concert. How the music affected Red Angel. John enraptured. How it touched him. The change in his eyes. The field mouse. How different animals are moved by music. The lion. Hippopotamus. Tigers. Monkeys. Momentary flashes of intelligence in John. Building a new wagon. Finding and making paint. Lead. Fermentation. Flax. Driers. Turpentine. Synthetic food. Analysis. Tubes for powder. Completing the guns. Stocking the wagon with provisions. Starting on the trip. Jack and Jill. The sixth trip.

The trip along Cataract River. The great forest. How Angel traveled. Reaching South River. Discovering a second falls. Where the debris on a seashore comes from. The jungle. Leaving the river. The two animals in the night. The camp aroused. A fight in the dark. The puma. The frightened team. The injured yak. Animal language. The panther. Trying to avoid the forest. Growing denser. John and Harry scouting through the forest. Blazing a trail. The hidden luncheon. End of the forest. Returning to the wagon. The noise in their path. The wagon following the trail. The injured yak improving.